Gilpin Girl: Some interesting comments here; maybe some of them would work best for your strange problem!
Have you thought about agreeing with "Crazy?" I've discovered the easiest way to stop an angry person in his/her tracks is to agree with what they are saying.
Scenario: You are in proximity to "Crazy" between shifts. Approach her with a conspiratorial attitude and whisper excitedly to her: "I found out you are right about Rock Band. They contacted me last night and explained everything. The bad part is that they told me that if we discuss this even once they are going to come after us!"
Then jump back and wait by the door for her to leave!!!
Mostly joking here, but hey, it could work!!!
Does anyone see a downside here??
PS: Have you checked to see if she's related to anyone in the HR dept. or your boss??